Update 02-Set.md

Author: Fahd-Bin-Ashfaq

week_8/02-Set.md

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-Sets are used to store multiple items in a single variable.
+## Python Data Types: List, Set, Tuple, and Dictionary
+
+### 2. Set
 
+Sets are used to store multiple items in a single variable.
 A **set** is one of the 4 built-in data types in Python used to store collections of data. The other 3 are **List**, **Tuple**, and **Dictionary**, each with different qualities and usage.
 
 A **set** is a collection that is: